Exercise not registering
Is there something wrong with exercise app on iwatch.
Apple Watch Series 5, watchOS 7
User profile for user:
Community User
Check that the watch is snug but not tight.
Make sure the watch isn't on top of any tattoos.
Update your personal info in your health app profile.
And;
Get the most accurate measurements using your Apple Watch – Apple Support
Calibrating your Apple Watch for improved Workout and Activity accuracy – Apple Support